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Cosmetic powder coated with alginic acid and methods of making the same

a technology of alginic acid and cosmetic powder, applied in the field of cosmetic powder materials, can solve the problems of difficult to achieve the effect of chemical immobilization of surface treatment agent on materials, difficult to achieve the effect of soft focusing

Inactive Publication Date: 2014-08-07
U S COSMETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a surface-treated cosmetic powder that has been chemically modified with alginic acid and its salt forms. The alginic acid is permanently attached to the surface of the powder using a metal-containing salt. The resulting powder has improved properties, such as increased adhesion, reduced skin irritation, and improved skin feel. The patent also includes a method for making the surface-modified powder. A cosmetic formulation containing the treated powder and a carrier is also provided. The technical effect is a more desirable and effective cosmetic powder that enhances the user's experience.

Problems solved by technology

Untreated powder aggregates easily due to the charge or polarity on the powder surface, and due to small amounts of impurities.
There are many types of lipophilizing treatment, but there are few known conventional hydrophilizing treatments (silica treatment).
Hydrophilizing treatments that are known are not entirely satisfactory.
This results in mottles and color differences between a coating color and a resultant color.
In addition, re-dispersibility sometimes worsens, which is inconvenient in its use.
Further, some of the known surfactants cause skin irritation, which is problematic in cosmetics.
Without these emulsifiers, dispersion in water-based systems often becomes problematic.
However, the use of emulsifiers also has its drawbacks, as emulsifiers tend to be irritating to the skin and eye mocosa, especially on individuals with sensitive conditions.
It also is known that direct contact of inorganic and organic cosmetic powders with the skin may lead to the absorption of the water on the skin surface, thus altering the natural hydrophilic and lipophilic balance, which may cause localized dehydration effects and consequently unpleasant feelings by those using these products.
In addition, the lack of homogeneity of the powders used, having different physical features from one another, may ultimately generate clearly perceptible defects.
Therefore, in the cosmetic composition from U.S. Pat. No. 5,496,544, the absence of a covalent chemical bond between the powder phase and fat-based binder has the drawback of an easy extraction of the latter from the powder phase.
However, the direct reaction between methylhydrogenpolysiloxane containing reactive Si—H bonds and the powder surface described in EP 1 116 753 never reaches completion and it has the disadvantage to release some H2 over time, which is the cause of several drawbacks for the obtained cosmetic powder.
Indeed, on the one hand the generation of H2 may cause the containers carrying the powder to swell and deteriorate, on the other hand the powder itself may harden and break.

Method used

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  • Cosmetic powder coated with alginic acid and methods of making the same
  • Cosmetic powder coated with alginic acid and methods of making the same
  • Cosmetic powder coated with alginic acid and methods of making the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Alginic Acid Coated Powder

[0081]The present example discloses how to coat a cosmetic powder with alginic acid. While the example describes coating titanium dioxide with alginic acid, the same method was used to coat other powders used in the examples described herein.

[0082]Approximately 97 grams of water were mixed together with about 3 grams of alginic acid, or sodium alginate, at about 50° C. using a ROBOMIX® disperser, commercially available from Primix Corporation, Osaka, Japan, for a period of about 20 minutes. To this homogenous mixture then were added about 97 grams of titanium dioxide powder commercially available from Ishihara Corp., San Francisco, Calif., and mixed until homogenized. To this homogenized powder-containing solution then were added stepwise by metering, aluminum sulfate, until the pH of the mixture reached a value of 4.0. The product obtained then was separated from the mixture and dried at a temperature of about 105° C. for 16 hours to produce...

example 2

Preparation of Powder Foundation

[0087]Mica was coated with alginic acid in accordance with the procedure described in Example 1. The mica coated with alginic acid then was formulated into a powder foundation formulation as shown in Table 1 below. The same powder foundation also was prepared using mica that was not coated with alginic acid, and compared by measuring the feeling, dispersibility, and stability of the respective compositions. Feeling, dispersibility, and stability were determined using the following criteria:

[0088]Feeling: Feeling was determined using a questionnaire provided to humans who tested the composition, where the individuals tested used the following scale to grade the feeling:[0089]5: excellent, 4: Good, 3: average, 2: fair, 1: poor;

[0090]Dispersibility: The sample was maintained in an oven at 50° C. and dispersibility measured as above, with the dispersibility measurements recorded as follows:[0091]5: 1 month later less than 50% settle down, 4: 1 month later...

example 3

Preparation of Skin Toner Formulation

[0095]Iron oxide was coated with alginic acid in accordance with the procedure described in Example 1. The iron oxide coated with alginic acid then was formulated into a skin toner formulation as shown in Table 2 below. The same skin toner formulation also was prepared using iron oxides that were not coated with alginic acid, and compared by measuring the feeling, dispersibility, and stability of the respective compositions.

TABLE 2ComponentExample 3Comparative Example 3Alginic acid - Iron oxide (yellow) 0.3%—Alginic acid - Iron oxide (red) 0.1%—Alginic acid - Iron oxide (black)0.01%—Alginic acid-TiO2 0.5%—Iron oxide (yellow)— 0.3%Iron oxide (red)— 0.1%Iron oxide (black)—0.01%TiO2— 0.5%Water83.92% 83.92% Butylene Glycol  5%  5%Glycerin  10%  10%Carbomer 0.1% 0.1%NaOH0.01%0.01%Xanthan Gum0.05%0.05%Citrate0.01%0.01%Totals 100% 100%Feeling33Dispersibility52Stability42

[0096]As shown in the above table, the skin toner formulation prepared in accordance...

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Abstract

The present disclosure relates generally to cosmetic powders having improved dispersibility, feel, and stability in which the powders are surface modified with at least one alginic acid, or salt form thereof. The powders may be used in cosmetic compositions such as a powder foundation skin toner, skin lotion, or body wash.

Description

FIELD OF THE INVENTION[0001]The present disclosure relates generally to cosmetic powder materials having a surface treated with alginic acid, cosmetic formulations containing the surface treated powder, and methods of making a cosmetic powder having a surface treated with alginic acid. The cosmetic powders are readily dispersible in water and have improved stability in cosmetic compositions.BACKGROUND[0002]The information provided below is not admitted to be prior art to the present invention, but is provided solely to assist the understanding of the reader.[0003]A significant amount of powder is conventionally used for making makeup, skincare products, toiletries, and other products marketed and distributed by the cosmetic industry. One of the concerns with the use of high amounts of powder is the technology involved in dispersing the powder into water / oil to form cosmetic products.[0004]Untreated powder aggregates easily due to the charge or polarity on the powder surface, and due...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/73A61Q1/00A61Q19/00A61Q1/02A61Q19/10
CPCA61K8/733A61Q1/00A61Q19/10A61Q19/00A61Q1/02A61K8/022A61K8/0241A61K2800/614A61Q1/12
Inventor TAKEKAWA, SHOJISHIMIZU, KATSUMI
Owner U S COSMETICS
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